diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2023-04-08 20:30:47 +0000 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2023-04-08 20:30:47 +0000 |
| commit | 60b1a2f82dc96b254d6dec1bfd1c14ca056c21dd (patch) | |
| tree | 1de5c2c26d7f7d0a0def0bbe4c11971a12735730 /sys/src/9/port/devsegment.c | |
| parent | bd43bd6f1ae1b1ec7ee6873d9fd6766b049802e9 (diff) | |
kernel: Clear secrets on reboot
The idea is that when we reboot, we zero out
memory written by processes that have the private
flag set (such as factotum and keyfs), and also
clear the secrmem pool, which contains TLS keys
and the state of the random number generator.
This is so the newly booted kernel or firmware
will not find these secret keys in memory.
Diffstat (limited to 'sys/src/9/port/devsegment.c')
| -rw-r--r-- | sys/src/9/port/devsegment.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/sys/src/9/port/devsegment.c b/sys/src/9/port/devsegment.c index d24e0b72e..8c3a503ea 100644 --- a/sys/src/9/port/devsegment.c +++ b/sys/src/9/port/devsegment.c @@ -467,7 +467,6 @@ Found: static Segment* fixedseg(uintptr va, ulong len) { - KMap *k; Segment *s; Page **f, *p, *l, *h, *t; ulong n, i; @@ -522,15 +521,11 @@ fixedseg(uintptr va, ulong len) p++; p->ref = 1; p->va = va; + va += BY2PG; p->modref = 0; settxtflush(p, 1); - - k = kmap(p); - memset((void*)VA(k), 0, BY2PG); - kunmap(k); - + zeropage(p); segpage(s, p); - va += BY2PG; } while(p != l); poperror(); return s; |